Tomcat's <Host> corresponds to GlassFish's <virtual-server>.
From the above link:
You can nest one or more Context elements inside this Host element,
each representing a different web application associated with this
virtual host.
You can accomplish the same in GlassFish, by specifying the "--virtualservers <virtual_servers>" option at the "asadmin deploy" command line, or when you deploy a webapp via the admingui.
If you don't specify this option, the webapp will be deployed onto all virtual servers (except the admin related virtual server).
The virtual servers to which a webapp has been deployed are listed as the value of the "virtual-servers" attribute of the <application-ref> element corresonding to the webapp in your domain.xml.
See
http://blogs.sun.com/jluehe/entry/presentation_on_virtual_hosting_features
http://blogs.sun.com/jluehe/entry/virtual_hosting_features_in_glassfish
for additional info on virtual servers in GlassFish.
Jan
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